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Investment Casting prototype
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It was in 1940s that modern lost foam casting method was applied in industrial production. According to the data, the development of Aerojet engine at that time required the manufacture of heat-resistant alloy parts with complex shape, accurate size and smooth surface, such as blades, impellers and nozzles. Because it is difficult to machine heat-resistant alloy materials and the shape of parts is complex, so it is impossible or difficult to use other methods to manufacture them. Therefore, it is necessary to find a new and precise forming process. To learn from the lost foam precision casting handed down in ancient times, after the improvement of materials and process, the modern lost foam investment casting method obtains important development on the basis of ancient technology. Therefore, the development of the aviation industry promotes the application of lost foam pattern for investment casting, and the continuous improvement and perfection of investment casting also create favorable conditions for the aviation industry to further improve its performance.
With the rapid development of 3D printing technology, combined with the application of computer technology, great changes have been brought to the structure design, process formulation, press design and manufacturing, wax mold forming, shell manufacturing, core manufacturing of investment casting. The biggest advantage of 3D printing for investment casting is that the casting has a high dimensional accuracy and surface finish, so it can reduce the machining work, just leave a little machining allowance for the parts with high requirements, and even leave only grinding and polishing allowance for some castings, which can be used without machining. It can be seen that the investment casting method can save a lot of machine equipment and processing time, greatly save metal raw materials, and environmental protection.
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